1000 Meters SIMATIC S7 1200 PLC 6ES7241-1CH30-1XB0 CB 1241 RS485

SIMATIC S7-1200 PLC 6ES7241-1CH30-1XB0 CB 1241 RS485

I. Product Description:

The SIMATIC 6ES7241-1CH30-1XB0 is a communication board for the SIMATIC SIMATIC S7-1200 series; its full model number is CB 1241 RS485. It is used to directly expand the S7-1200 PLC with an RS485 serial communication interface, enabling it to exchange data with field devices that support protocols such as Modbus RTU and Freeport.

Interface Type RS485

Supported Protocols Freeport, Modbus RTU (Master/Slave), USS

Transmission Distance Up to 1000 meters

Baud Rate Up to 115.2 kbps

Electrical Isolation 707 V DC

Power Supply Powered by the S7-1200 CPU via the backplane bus

Current Consumption 5 V DC: 50 mA (typical); 24 V DC: 80 mA

II. Product Specifications:

SIMATIC 6ES7241-1CH30-1XB0｜SIMATIC S7-1200 CB 1241 RS485 Communication Board

Mounting Type: Communication board mounted directly on a compatible S7-1200 CPU;
Connection Type: Terminal block;
Point-to-Point Communication: Supported;
Maximum Communication Distance: Up to 1,000 m;
Freeport Communication: Supported;
ASCII Communication: Supported;
Modbus RTU Master: Supported;
Modbus RTU Device: Supported;
USS Communication: Supported;
Maximum Freeport Telegram Length: 1 kbyte;
Character Length: 7 or 8 bits;
Stop Bits: 1 or 2;
Parity: None, even, odd, mark, or space;
Maximum Modbus RTU Devices: Up to 247 slave addresses, with up to 32 devices per network segment without repeaters;
Diagnostic Functions: Supported;
Status Indication: LED status indication supported;
Backplane Bus Current Consumption: Approximately 50 mA at 5 V DC;
Typical Power Loss: 1.5 W;
Power Supply: Supplied through the S7-1200 CPU backplane;
Engineering Software: STEP 7 / TIA Portal;
Configuration: Parameterizable through the TIA Portal engineering environment;
System Compatibility: SIMATIC S7-1200 automation systems;
Protection Rating: IP20;
Operating Temperature: 0 to 55 °C for horizontal installation;
Operating Temperature for Vertical Installation: 0 to 45 °C;
Storage / Transport Temperature: -40 to 70 °C;
Maximum Relative Humidity: 95% at 25 °C, non-condensing;
Dimensions (W × H × D): Approximately 38 × 62 × 21 mm;
Net Weight: Approximately 31 g;
Typical Applications: RS485 serial communication, Modbus RTU networking, USS drive communication, Freeport communication, ASCII device communication, serial sensors, barcode scanners, weighing systems, motor drives, and industrial automation systems based on the SIMATIC S7-1200 platform

III. Technical Parameters:

SIMATIC S7-1200, Communication Board CB 1241, RS485, terminal block, supports Freeport

IV. Industries Served:

The SIMATIC S7-1200 6ES7241-1CH30-1XB0 is commonly used for centralized control system retrofits in industries such as chemical processing, coal chemical processing, and energy. For example, it connects to field devices such as temperature controllers and transmitters via Modbus RTU, aggregates the data, and transmits it through an upper-level network (such as Modbus TCP) to the DCS system in the central control room, enabling remote monitoring.

Compared to the standalone communication module (CM 1241), the core advantage of the signal board (CB 1241) is that it does not occupy an expansion slot for signal modules; instead, it plugs directly into the CPU, offering a more compact and cost-effective serial port expansion solution. If you have limited rack space on your S7-1200 and only need to expand a single RS485 port, this is the ideal choice.

V. Customer Case Studies:

Automation Upgrade Project for a Production Line at a Medium-Sized Steel Company in India | SIMATIC S7 Full Series PLC Application Case Study

·1 SIMATIC S7-400H redundant PLC master system (core control for the main rolling line)

·2 SIMATIC S7-1500 series PLCs (temperature control for heating furnaces, logic control for the finishing line)

·SIMATIC S7-300 Series PLC Modules: a batch (for new slave stations and on-site spare parts replacement)

SIMATIC S7-1200 Series PLCs: 5 sets (for auxiliary processes such as raw material conveyance, water treatment, and dust collection systems)

Issue 1: It is difficult to achieve synergy between the old and new systems, making unified management unfeasible.

Issue 2: Equipment reliability is insufficient under extreme operating conditions, and the failure rate remains high.

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